-------------------------------------------------------------------------- d13C(CH4) data of the clean air monitoring station Alert -------------------------------------------------------------------------- Institut für Umweltphysik (IUP) University of Heidelberg, Germany -------------------------------------------------------------------------- LAST UPDATE: 05/2017 CONTRIBUTORS: C.Veidt, C.Poß, and I. Levin -------------------------------------------------------------------------- SAMPLING LOCATION: Alert, Ellesmere Island, Nunavut, Canada 82.45°N 62.52°W 210m a.s.l. -------------------------------------------------------------------------- REFERENCES: C. Veidt PhD thesis in preparation Levin I., C. Veidt, B. H. Vaughn, G. Brailsford, T. Bromley, R.Heinz, D. Lowe, J. B. Miller, C. Poß, and J. W. C. White No inter-hemispheric d13CH4 trend observedNature, Vol.486, 28.6.2012, pages E3-E4, doi:10.1038/nature11175 NOTE: PLEASE CITE THE LATTER REFERENCE WHEN USING THIS DATA -------------------------------------------------------------------------- 13C/12C ratios of CO2 derived from catalytical combustion of the extracted CH4 samples were measured with a dual inlet mass spectrometer (MAT 252, Finnigan). Hence d13C(CH4) results are NOT affected by the Kr-effect described in J. Schmitt et al., AMT 2013, DOI: 10.5194/amt-6-1425-2013. -------------------------------------------------------------------------- SCALE: mole fraction on NOAA04 scale d13C is reported as deviation from the standard VPDB in permil d13C(CH4) values are reported on UHEI scale -------------------------------------------------------------------------- Column 1: start of sampling (Alert: integrated sampling) Column 2: end of sampling in decimal year Column 3: Alert CH4 mole fraction in ppb Column 4: individual error in ppb (1 sigma standard deviation + error propagation) Column 5: Alert d13C(CH4) data in permil versus V-PDB Column 6: individual error in permil point (1 sigma standard deviation + error propagation) -------------------------------------------------------------------------- start stop CH4 1sig d13CH4 1sig 1993.875 1993.916 1836.4 5.0 -47.83 0.10 1993.922 1993.952 1842.5 5.0 -47.88 0.10 1993.952 1993.990 1837.1 5.0 -47.98 0.10 1994.029 1994.067 1863.9 5.0 -47.74 0.10 1994.067 1994.105 1852.6 5.0 -47.76 0.10 1994.105 1994.144 1856.9 3.0 -47.93 0.10 1994.144 1994.182 1855.6 5.0 -47.67 0.10 1994.182 1994.220 1860.1 3.0 -47.80 0.10 1994.220 1994.259 1862.1 3.0 -47.79 0.10 1994.259 1994.297 1845.7 3.0 -47.77 0.10 1994.297 1994.335 1848.6 3.0 -47.84 0.10 1994.453 1994.489 1810.1 3.0 -47.59 0.10 1994.489 1994.527 1808.9 3.0 -47.70 0.10 1994.527 1994.565 1794.1 3.0 -47.62 0.10 1994.642 1994.680 1805.6 3.0 -47.68 0.10 1994.834 1994.872 1825.7 3.0 -47.83 0.10 1994.872 1994.897 1847.2 3.0 -47.96 0.10 1994.910 1994.949 1843.2 3.0 -47.86 0.10 1995.179 1995.217 1847.3 3.0 -47.66 0.10 1995.217 1995.255 1861.5 3.0 -47.71 0.10 1995.332 1995.370 1829.8 3.0 -47.60 0.10 1995.370 1995.409 1827.3 3.0 -47.74 0.10 1995.447 1995.485 1810.1 3.0 -47.65 0.10 1995.524 1995.562 1808.0 3.0 -47.41 0.10 1995.639 1995.677 1818.5 3.0 -47.84 0.10 1995.677 1995.715 1828.7 3.0 -47.79 0.10 1995.715 1995.754 1839.3 3.0 -48.16 0.10 1995.754 1995.786 1837.4 3.0 -48.10 0.10 1995.795 1995.830 1838.2 3.0 -48.04 0.10 1995.830 1995.869 1844.0 3.0 -48.12 0.10 1995.869 1995.907 1841.6 3.0 -48.15 0.10 1995.984 1996.025 1863.0 3.0 -47.80 0.10 1996.175 1996.192 1862.0 3.0 -47.81 0.10 1996.252 1996.290 1847.0 3.0 -47.73 0.10 1996.290 1996.329 1842.0 3.0 -47.62 0.10 1996.329 1996.372 1838.7 3.0 -47.65 0.10 1996.367 1996.405 1829.4 3.0 -47.73 0.10 1996.405 1996.444 1833.1 3.0 -47.70 0.10 1996.444 1996.482 1824.2 3.0 -47.48 0.10 1996.482 1996.520 1817.9 3.0 -47.57 0.10 1996.520 1996.559 1819.7 3.0 -47.67 0.10 1996.559 1996.589 1811.7 3.0 -47.41 0.10 1996.597 1996.635 1808.3 3.0 -47.72 0.10 1996.635 1996.674 1821.0 3.0 -47.74 0.10 1996.674 1996.712 1830.9 3.0 -47.83 0.10 1996.712 1996.750 1835.2 3.0 -47.94 0.10 1996.750 1996.789 1846.2 3.0 -47.94 0.10 1996.789 1996.827 1848.9 3.0 -48.03 0.10 1996.865 1996.903 1865.8 3.0 -47.98 0.10 1996.999 1997.038 1850.8 3.0 -47.68 0.10 1997.038 1997.087 1889.1 3.0 -47.91 0.10 1997.087 1997.114 1866.7 3.0 -47.83 0.10 1997.114 1997.153 1877.3 3.0 -47.81 0.10 1997.210 1997.248 1839.3 3.0 -47.65 0.10 1997.325 1997.363 1852.0 3.0 -47.44 0.11 1997.361 1997.402 1830.0 3.0 -47.69 0.10 1997.402 1997.440 1825.6 3.0 -47.42 0.10 1997.498 1997.536 1805.5 3.0 -47.54 0.10 1997.536 1997.574 1808.7 3.0 -47.53 0.10 1997.574 1997.613 1808.1 3.0 -47.55 0.13 1997.613 1997.651 1815.0 2.0 -47.72 0.13 1998.292 1998.330 1851.1 1.9 -47.50 0.10 1998.333 1998.368 1856.5 3.8 -47.55 0.10 1998.368 1998.407 1863.0 2.3 -47.60 0.10 1998.407 1998.445 1836.4 2.0 -47.52 0.10 1998.464 1998.502 1821.2 2.3 -47.61 0.07 1998.502 1998.543 1823.2 3.0 -47.71 0.10 1998.579 1998.617 1827.2 3.1 -47.90 0.07 1998.617 1998.658 1831.0 2.8 -47.71 0.10 1998.667 1998.694 1839.2 3.3 -47.74 0.10 1998.694 1998.732 1838.4 1.8 -47.92 0.11 1998.732 1998.771 1850.2 3.3 -47.78 0.10 1998.771 1998.809 1870.4 2.8 -47.80 0.06 1998.809 1998.847 1864.4 3.2 -47.77 0.06 1998.847 1998.888 1859.2 2.5 -47.95 0.06 1998.924 1998.962 1896.5 2.0 -47.89 0.06 1999.077 1999.118 1876.8 2.4 -47.65 0.05 1999.154 1999.192 1880.5 1.5 -47.73 0.09 1999.192 1999.231 1865.0 2.7 -47.51 0.06 1999.280 1999.307 1867.2 2.5 -47.56 0.06 1999.348 1999.384 1851.5 4.9 -47.52 0.08 1999.463 1999.499 1834.8 2.8 -47.43 0.18 1999.710 1999.748 1836.6 3.9 -47.74 0.19 1999.748 1999.786 1846.7 2.1 -47.84 0.04 1999.786 1999.822 1847.8 2.2 -47.95 0.13 2000.036 2000.077 1877.8 2.6 -47.52 0.13 2000.151 2000.181 1880.0 2.5 -47.51 0.18 2000.345 2000.381 1856.4 2.0 -47.47 0.09 2000.419 2000.457 1842.1 2.2 -47.42 0.11 2000.496 2000.537 1828.2 1.8 -47.68 0.19 2000.545 2000.575 1825.3 2.0 -47.48 0.13 2000.613 2000.649 1829.6 2.7 -47.71 0.19 2000.649 2000.687 1836.5 2.1 -47.81 0.18 2000.726 2000.764 1844.1 2.5 -48.10 0.19 2000.805 2000.841 1851.1 2.0 -47.95 0.18 2000.994 2001.032 1858.7 2.1 -47.74 0.13 2001.070 2001.112 1867.6 2.2 -47.78 0.09 2001.224 2001.254 1862.8 2.7 -47.65 0.02 2001.265 2001.300 1865.8 1.6 -47.76 0.08 2001.300 2001.331 1865.9 2.1 -47.49 0.13 2001.342 2001.369 1861.4 2.6 -47.62 0.04 2001.377 2001.415 1850.6 1.8 -47.47 0.18 2001.454 2001.495 1838.5 2.0 -47.26 0.13 2001.495 2001.530 1845.8 2.6 -47.50 0.06 2001.700 2001.733 1839.7 2.4 -47.83 0.08 2001.818 2001.862 1856.6 1.9 -47.87 0.11 2001.895 2001.925 1868.9 2.0 -47.77 0.18 2001.933 2001.974 1870.3 2.4 -47.81 0.06 2002.012 2002.051 1878.3 2.2 -47.74 0.11 2002.220 2002.242 1863.5 1.1 -47.53 0.03 2002.393 2002.434 1839.9 1.8 -47.44 0.03 2002.565 2002.604 1831.6 1.2 -47.59 0.04 2002.795 2002.834 1855.8 1.9 -47.70 0.03 2002.834 2002.872 1860.5 1.3 -47.95 0.02 2002.949 2002.987 1889.0 1.3 -47.61 0.03 2003.116 2003.159 1894.0 1.3 -47.49 0.03 2003.255 2003.296 1872.4 2.7 -47.49 0.03 2003.332 2003.370 1862.3 2.5 -47.53 0.02 2003.411 2003.450 1853.3 1.3 -47.53 0.03 2003.524 2003.562 1837.5 1.2 -47.63 0.03 2003.600 2003.644 1843.0 1.3 -47.78 0.02 2003.677 2003.715 1849.5 2.7 -47.79 0.03 2003.830 2003.869 1867.5 2.2 -47.92 0.03 2003.869 2003.907 1870.6 1.4 -47.98 0.02 2003.907 2003.948 1875.6 2.7 -47.78 0.03 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